The massive structure - almost a mile long - contains a spiral design, with several rectangular spirals that form a giant structure, archaeologists say. "This structure, which has dimensions of more than 1,500 m × 600 m (about 1 mile by 1,970 feet) is the most striking discovery associated with Angkor Wat to date. Its function remains unknown and, as yet, it has no known equivalent in the Angkorian world," Roland Fletcher, a University of Sydney professor, said in a statement put out by the university. Today, the spiral structure is hard to make out on the ground, having been...